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OSRAM CMG8 PHOTO CELL VALVE, 1920's
Osram CMG8 early Photo Cell, possibly for the Movie picture industry and the beginnings of sound cinema.
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- I came across one of these valves from a house clearance in the 1980's. It is still in its original wooden blue velvet lined box which is covered in simulated black leather. The valve does dot have the CMG8 marking but marked as 'GEC Ltd TYPE(blank) OSRAM PHOTO CELL' and what may be a Serial No. 5075 printed vertically.
.......... Terence Greenwood, Greasby, Wirral, Merseyside, 13th of June 2012